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XP21
FAN MOTOR SURGE PROTECTION
(XP21-XXX-230-01 only)
Surge Protector (metal oxide varistor) - A component de
signed to protect electrical devices from voltage spikes that
are 3-to-4 times the normal circuit voltage (See figure 10 for
illustration of component).
How it works: It is essentially a batch of metallic-oxide
grains separated by insulating layers. Repeated voltage
surges break down the insulating layers, lowering the over
all resistance and eventually causing the device to draw
too much current and trip whatever over-current protection
is inherent in the system.
Surge Protector Check: They are supposed to be located
beyond the line fuse (though possibly not always). In this
case, where the line fuse blows or circuit breaker trips but
there is no visible damage to the surge protector, the sim
plest test may be to just temporarily remove the surge
protector and see if the problem goes away.
See figure 1 for location of the surge protection device in
the unit control box area.
Figure 10. Fan Motor Surge Protection Device
(XP21-XXX-230-01 only)
FAN MOTOR SURGE PROTECTION
(XP21-XXX-230-02 and later)
Starting with the reference build above, the fan motor surge
protection is in built into the fan motor itself.
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